What is the best product for corrosion protection on the inside of a re-chromed bumper?

[mrtask]

I've just fitted a newly re-chromed rear bumper. The bent one I removed had a thick coat of wax on the back, which had seemingly served well over the years. What product would other P6ers suggest I smother the inside of the new with, to inhibit corrosion?

 

[Quagmire]

I am quite liking "Dynax" from Bilt Hamber, got good reviews and I have the "UB" version on the underside of both my P6 and Defender. Has been on a few years and seems to be working well so far. There is a clear version, although I haven't tried that.

 

[quattro]

I used Dinitrol on mine - I think it was 3125

 

[jp928]

Great timing, just noticed rust inside my recently replated bumper!